The only time we ever need to update a manifest value is when
we update the expiration time. To make it easier to support
updating expiration time across different version, only allow
that one value to be updated.
Change-Id: I621ec744019802edc65b059baa7f5cf0c476b0b1
Created a memory storage system that holds all data in main memory. This
system will be used in tests.
Needed to update the eslint rules to allow us to have an instance-level
method that does not use |this|.
Issue: #1248
Change-Id: If1ebbec62bfdae57ee06df9fdef9955b30579d52